This donut converter quickly and easily turns your favorite fiber optic or gemstone donut into a fashionable pendant! Unlike wire wrapping your donut, this handy finding is interchangeable, so you can swap out the focal component of your design as often as it suits you! This stylish converter fits both 30mm and 40mm sizes. The fit will be rather snug on the 40mm donuts with smaller holes, but will fit with a little persistence.